Why do oil paint thinner?

1. Solubility: for paints of different systems, different solvents are needed. Not all solvents dissolve the same resin. The dissolution of solvent to resin follows the principle of polar similarity, the principle of solubility parameter proximity and the principle of solvation. When planning the formulation of the diluent, it is necessary to make the diluent available to dissolve the chosen resin and to generally consider the cost and other elements. A good diluent formulation is full of true solvents, cosolvents and diluents, reaching some equilibrium.

2. Viscosity: in the process of coating making, we also want the resin solution with the same concentration (or solid content), the lower the viscosity, the better. In this way, when the same construction viscosity is reached, the solid content of the paint liquid is higher, thus making the construction power forward, while the amount of solvent transpiration to the atmosphere is less, and the pollution to the environment is lighter. And because of its solubility to the polymer and its own viscosity, solvent on the viscosity of oil paint composition of great impact.

3. Transpiration rate: the monotonic coating is formed in the process of solvent transpiration. In this process, the action of the solvent is to control the activity of the film composition. Assuming that the solvent transpiration is too fast, the coating will neither be flat nor have satisfactory wetting to the substrate, and therefore will not have excellent adhesion. Transpiration of overly sensitive solvents will also result in a white film formed by condensation of water vapour on the wet film surface as a result of sensitive cooling. Assuming that the solvent transpiration is too slow, not only will delay the monotonic moment, but also the film will flow and become very thin. The solvent in the transpiration process, also to maintain a suitable transpiration gradient. If the composition of the solvent is changed undesirably during transpiration, the deposition of the resin and the defects of the coating will occur. Therefore, the transpiration rate of solvent is a very important factor affecting the quality of coatings and coatings.

4. Surface tension: the surface tension of solvent will affect the surface tension of coating. In guessing, surface tension is a primary policy. The low surface tension is favorable, it has a lively effect on the wet loose of the pigment, the wet of the substrate, the leveling of the coating, the adhesion of the substrate, the spray atomization performance and the prevention of surface defects (such as holes, shrinkage holes, frames, etc.) of the coating. In planning the formulation, it is necessary to take into account the surface tension of the solvent.

5. Resistivity: different solvents have different resistivity, and as for electrostatic spraying, resistivity becomes a primary policy. The best coating resistivity is one of the necessary parameters for electrostatic spraying. When coating USES the method of electrostatic spray, often meet certain not easy electrify oily coating, and through adjusting solvent formula, if be in, be involved in few diacetone alcohol in baking paint formula, can make its resistance drop to the resistance that is suitable construction namely.

6. Toxicity and safety: as the solvent is an organic transpiration substance, it is more or less toxic to human body.